Gray Screen and not recognizing EDTV (480p) connection

My Wii has been hooked up to my HDTV through the component connection for a long time now and I've never had a problem. The screen resolution was set to EDTV (480p). Now all of the sudden the screen has no color and when I go to options and screen resolution I can only select standard. It will not let me select the 480p resolution so its basically not recognizing that connection. Has anyone had this issue before?